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TI-2026-34240 Aliases CVE-2026-46562GHSA-vmwp-vh32-rj75

Yamcs: Remote Code Execution via Mission Database algorithm override

Priority HIGH 82CWE-470Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-94.

Summary

Yamcs is a mission control framework. Prior to 5.12.7, the Nashorn ScriptEngine used to evaluate user-supplied JavaScript algorithm text in yamcs-core/src/main/java/org/yamcs/algorithms/ScriptAlgorithmExecutorFactory.java was constructed without a ClassFilter, so a user with the ChangeMissionDatabase privilege could override an algorithm through the MdbOverrideApi.updateAlgorithm endpoint and supply JavaScript that reaches arbitrary Java classes (for example Java.type("java.lang.Runtime").getRuntime().exec(...)) to execute arbitrary OS commands as the Yamcs process; in the default configuration with no security.yaml the built-in guest user has superuser=true, making the issue reachable without authentication. This issue is fixed in versions 5.12.7 and 5.13.0, which disable algorithm editing by default.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00976 62nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed yamcs (yamcs): 5.12.7org.yamcs:yamcs-core (Maven): 5.12.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
yamcsyamcsbefore 5.12.75.12.7Patch availableCNA
—org.yamcs:yamcs-core (Maven)before 5.12.75.12.7Patch availableGHSA-vmwp-vh32-rj75
  • yamcs Vendoryamcs Affected before 5.12.7 Fixed in 5.12.7 Patch available CNA
  • org.yamcs:yamcs-core (Maven) Vendor— Affected before 5.12.7 Fixed in 5.12.7 Patch available GHSA-vmwp-vh32-rj75

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:spaceapplications:yamcs:*:*:*:*:*:*:*:*before 5.12.7Vulnerableyamcs
  • cpe:2.3:a:spaceapplications:yamcs:*:*:*:*:*:*:*:* Versions before 5.12.7 Vulnerable ·yamcs

Remediation

  • Fix · CNA yamcs (yamcs) Fixed in 5.12.7
  • Fix · GHSA-vmwp-vh32-rj75 org.yamcs:yamcs-core (Maven) Fixed in 5.12.7 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-46562
  2. 2026-10-03 Alias added: GHSA-vmwp-vh32-rj75

References

Exploit 1

Patch 2

Other 3

  • TI-2026-32507 Yamcs: No Rate Limiting on Authentication Endpoint CVSS 3.1CRITICAL 9.8
  • TI-2026-34277 Yamcs: Authenticated Remote Code Execution (RCE) via Jython Algorithm Code Injection CVSS 3.1CRITICAL 9.1
  • TI-2026-32532 Yamcs: Server-Side Code Injection (RCE) via Janino Expression Engine in `JavaExprAlgorithmExecutionFactory` CVSS 3.1CRITICAL 9.1
  • TI-2026-40093 Yamcs: Insecure Direct Object Reference (IDOR) in PacketsApi allows unprivileged users to dump all telemetry packets CVSS 3.1MEDIUM 4.3
  • TI-2026-32506 Yamcs: Unauthorized user enumeration via IAM API endpoints CVSS 3.1MEDIUM 4.3
  • TI-2023-24268 Directory Traversal vulnerability in the storage functionality of the API in Yamcs 5.8.6… CVSS 3.1CRITICAL 9.1
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences